# CVE-2026-104066: Scribus before 1.6.7 and 1.7.x before 1.7.4 Heap Buffer Overflow via PICT 4-bit Pixel Unpacking

Status: published. Published: 2026-10-30. Updated: 2026-11-02.

Scribus before 1.6.7 and 1.7.x before 1.7.4 contains a heap buffer overflow vulnerability in the Mac PICT image loader and import plugin when unpacking 4-bit indexed pixel data. Attackers can supply a crafted PICT file with inconsistent width and row data that, when placed or imported, writes out of bounds, causing crashes or code execution.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/scribusproject/scribus/commit/d667b3b1d38e1808721315dc976d67b72070f6b4
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/scribusproject/scribus/commit/544a179241362eb254cb69a5cc68ef24388b265f

## Affected products and versions

- Scribus / Scribus: ≥ 0; < 1.6.7 (affected, custom); ≥ 1.7.0; < 1.7.4 (affected, custom). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.5 (high); CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.21% as of 2026-11-02; percentile 11.51%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-787

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/scribusproject/scribus/commit/d667b3b1d38e1808721315dc976d67b72070f6b4 (CNA: VulnCheck; patch)

- https://github.com/scribusproject/scribus/commit/544a179241362eb254cb69a5cc68ef24388b265f (CNA: VulnCheck; patch)

- https://github.com/scribusproject/scribus (CNA: VulnCheck; product)

- https://wiki.scribus.net/canvas/1.6.7_Release (CNA: VulnCheck; release-notes)

- https://www.vulncheck.com/advisories/scribus-before-1.6.7-heap-buffer-overflow-via-pict-4-bit-pixel-unpacking (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-104066; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-104066; retrieved 2026-11-02; source updated Not reported

Revision: e7521b53c416f3b2ba4b8428ec5d2a1616607d2855e38ca29d0fc0e0d9519945

Canonical: https://y2.dev/cve/CVE-2026-104066

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